Journal Article

FZJ-2021-00458

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Removing Instability-Caused Low-Frequency Features in Small Perturbation Spectra of Perovskite Solar Cells

Ravi Shankar, S.FZJ* ; Garcia-Batlle, M. ; Bisquert, J. ; Garcia-Belmonte, G. (Corresponding author) ; Odrobina, J. ; Schiller, C.-A.

2020
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/26980  doi:10.1021/acs.jpcc.0c04050

Abstract: Small-perturbation frequency-domain techniques such as impedance spectroscopy and intensity-modulated photocurrent spectroscopy (IMPS) have become important methods for the investigation of the physical working mechanisms of the perovskite solar cell (PSC). The validity of these methods relies on assuming sample stability at the given steady state. Through a series of IMPS measurements, we identify that this assumption is invalid in certain cases for both iodide and bromide-based PSCs that show strong time drift in their IMPS response, noticeable in particular at low frequencies, which are usually connected with the kinetics of ionic motion and interaction with outer electrodes. Using time course interpolation and a corrective Z-HIT algorithm that connects the modulus of the IMPS transfer function and its phase, we identify that the low-frequency arc/tail is in certain cases an artifact generated by time drift of the sample. Since the low-frequency data in an IMPS measurement of the PSC provide important information regarding its differential external quantum efficiency, care must be taken to ascertain the origin and validity of the low-frequency phenomena. Validity test is performed by using a combination of corrective algorithms mentioned above and several measurements over time to obtain stabilized spectra virtually free of time drift.

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Contributing Institute(s):

1. Photovoltaik (IEK-5)

Research Program(s):

1. 121 - Solar cells of the next generation (POF3-121) (POF3-121)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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